Addons failing in 2.79 daily builds, here is the error
Both Animation Nodes and CubeSurfer are compiled addons and subsequently only work on the operating system and python version they were compiled at.

Prior to blender 2.79.x (nightly builds now), all blender versions used python 3.5, thus almost all Animation Nodes and CubeSurfer builds used python 3.5 to compile. Now that blender uses 3.6, all those builds will fail to work just as you experienced.

Solution

You will have to compile your own builds using python 3.6 or wait for the developers to release new builds.